Nice initiative by a reporter in Hong Kong to reduce the carbon emissions in Hong Kong. Really it's so simple to contribute to helping save the world. Might be a little risky to try what he did. But atleast if you are the driver with your car engine running in one of these traffic signals, shut it off.
I'll do my bit from now on. Off to shut off the light in the room (use some natural light for a change). Hope you do too.